Political Districts and Boundaries in Illinois

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Frequently-anticipated questions:


What does this data set describe?

Title: Political Districts and Boundaries in Illinois
Abstract:
This feature dataset contains data layers that show political districts and boundaries in Illinois, including political townships, state representative (house) and legislative (senate) districts, and US congressional districts. Attributes include district number and name of the corresponding representative or senator. The time periods correspond to the three most recent instances of the US Census (1980, 1990, 2000). The data are current as of 2009, except political townships, which show the data as of 1985.

Please refer to the metadata for individual feature classes for additional and dataset-specific information.

"Now in its 93rd session, the Illinois General Assembly, composed of a 59-member Senate and a 118-member House of Representatives, is responsible for enacting, amending, or repealing laws, passing resolutions, adopting appropriation bills and conducting inquiries on proposed legislation. It also acts on amendments to the United States Constitution submitted by Congress, proposes amendments to the Illinois Constitution, and takes responsibility for impeachment and conviction of executive and judicial officeholders in the state." (Illinois Government web site, 2004, <http://www.illinois.gov/government/gov_legislature.cfm>)

The terminology applied to Illinois governmental bodies is sometimes used inconsistantly and can be confusing. The Illinois General Assembly is composed of the House of Representatives and the Senate. The General Assembly is sometimes referred to as the Illinois Legislature or the Illinois Congress. The state is divided into representative districts (House) and legislative districts (Senate). Each legislative district is composed of two representative districts, following this pattern: representative districts 1 & 2 = legislative district 1 representative districts 3 & 4 = legislative district 2 representative districts 5 & 6 = legislative district 3 etc.

The term "congressional district" usually refers to the federal body rather than a state body.

There are several web sites that can be used in conjunction with this feature dataset. Two are listed here and are included in the Online Links section.

Illinois State Board of Elections Voting Information, including district boundary descriptions and district search functions, <http://www.elections.state.il.us/>

Illinois Government Legislative Information, <http://www.illinois.gov/government/gov_legislature.cfm>

  1. How should this data set be cited?

    Various, by feature class, varies, Political Districts and Boundaries in Illinois: ISGS GIS Database GISDB.IL_ADMIN_Political_Districts, Various, by feature class, Champaign, Illinois.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.513518
    East_Bounding_Coordinate: -87.022340
    North_Bounding_Coordinate: 42.510709
    South_Bounding_Coordinate: 36.968510

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1980
    Ending_Date: 2009

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (118)
      • G-polygon (59)
      • G-polygon (59)
      • G-polygon (118)
      • G-polygon (118)
      • G-polygon (1691)
      • G-polygon (59)
      • G-polygon (19)
      • G-polygon (19)
      • G-polygon (118)
      • G-polygon (59)
      • G-polygon (118)
      • G-polygon (59)
      • G-polygon (19)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Contact_Instructions: Please refer to the Distribution Information section.


Why was the data set created?

These data are appropriate for use in regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a thematic, reference, or base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 30-Mar-2004 (process 1 of 3)
    ArcSDE feature dataset created to contain feature classes from source coverages.

    Feature dataset metadata created.

    Person who carried out this activity:

    Date: 21-Jul-2004 (process 2 of 3)
    Feature classes relating to the 2000 census were added. Please see metadata for individual feature classes.

    Metadata updated.

    Person who carried out this activity:

    Date: 23-Mar-2009 (process 3 of 3)
    Data for certain years through 2009 have been added over time.

  3. What similar or related data should the user be aware of?

    , ISGS Terms of Use.

    Online Links:

    , University of Illinois Web Privacy Notice.

    Online Links:

    , University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).

    Online Links:

    , Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    See metadata for individual feature classes.

  2. How accurate are the geographic locations?

    See metadata for individual feature classes.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    See metadata for individual feature classes.

  5. How consistent are the relationships among the observations, including topology?

    See metadata for individual feature classes.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved.  University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.

Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data.  Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.

The data do not replace the need for detailed site-specific studies.

  1. Who distributes the data set? (Distributor 1 of 1)

    Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-333-4747 (voice)
    isgs@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

    Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

    By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.


Who wrote the metadata?

Dates:
Last modified: 23-Mar-2009
Metadata author:

Contact_Instructions: Please refer to the Distribution Information section.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Illinois Natural Resources Geospatial Data Clearinghouse

Generated by mp version 2.8.25 on Thu Apr 02 09:53:56 2009